Shimano Dura-Ace (RD-7400) c.1986 Vintage Rear Derailleur

Shimano Dura-Ace (RD-7400) c.1986 Vintage Rear DerailleurOriginal part produced in the 1980s Suitable for historic cycling events such as L'Eroica Professionally checked & cleaned Worldwide shipping Shimano Dura Ace rear derailleur (or mech if you prefer), hailing from Japan and dating back to 1986. Made from aluminium steel and weighing in at 200 grams pretty lightweight for a rear derailleur at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike.

✓ Original part - produced in the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & cleaned
✓ Worldwide shipping

Shimano Dura-Ace rear derailleur (or mech if you prefer), hailing from Japan and dating back to 1986. Made from aluminium/steel and weighing in at 200 grams - pretty lightweight for a rear derailleur at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike.

If you're taking part in L'Eroica or a similar vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong rear mech!

The mech's been carefully cleaned, thoroughly checked by one of our mechanics and graded as very good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy.

OVERVIEW

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Body Condition - Very Good
Jockey Wheel Condition - Excellent
Model ID - RD-7400
Production Era - 1980s
Country - Japanese
Material - Aluminium / Steel
Weight - 200 g
Stock Code - U-G3-RM146V

TECHNICAL INFO

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Shifting System - Dura-Ace SIS, Dura-Ace STI, Friction
Speed* - 6 Speed
Max Cog Size - 26 Teeth
Max Chain Wrap - 28
Chain Width - 3/32" (Standard)

*See help section.

▼SHIPPING, TAXES & RETURNS

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We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 days but larger items and orders placed before the weekend can take an extra day or two to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

EU Customers – for orders under €150 (excluding shipping), VAT will be collected at checkout, but from 1st July 2026, due to new EU import regulations, there may also be a customs duty payable to the carrier. For orders over €150, all import fees will be payable to the carrier, with nothing collected at checkout.

USA Customers – import fees are now collected at checkout for all orders to the US, so there won’t be any surprise charges when your order arrives.

Other International Customers – local import fees may still apply, charged by your customs office or courier before delivery. These are not collected by us, so please check your local rates before purchasing.

Any applicable fees will appear at checkout.

▼SAFETY & COMPLIANCE

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This product complies with the EU General Product Safety Regulation (GPSR). Professional installation and regular inspections are recommended. Due to the product's age, extra care should be taken during use.

Product Manufacturer - Shimano Inc. 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

EU Authorised Representative - Global Trade Department NI Ltd, Office 834, Unit 6, 100 Lisburn Road, Belfast BT9 6AG, Northern Ireland

▼HELP SECTION

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Shifting system - friction means your gear levers don't click when you change gear, when they do click it's referred to as indexed shifting. If you have indexed gear levers they must use the same system as the rear derailleur, if you're using friction levers you can mix and match.

Speed - the number of cogs at the back the derailleur was designed to be used with. This is important with indexed shifting, but with friction shifters you can in theory run any rear mech with any number of cogs, but you are more likely to have issues running high numbers of cogs with mechs from earlier eras.

Max cog size - the amount of teeth on the largest cog of your freewheel/cassette can be no greater than this to work with this derailleur.

Chain wrap - subtract the size of your smallest rear cog from your biggest, then do the same with your chainrings, add the 2 numbers together and you have your chain wrap.

Chain width - generally speaking, derailleurs designed for more than 3 speed use will fit a standard 3/32'' chain, the exception being some Cyclo & Simplex models from around the mid 1900s.